Tour of Duty is a realistic team play mod for Halflife by Valve Software. The game is set at the height of the Vietnam war, between 1967 and 1973 allowing you to relive the conflict fighting either for the United States Marine Corp (USMC) or the Viet Cong (VC)/North Vietnamese Army (NVA). The mod features realistic weapons of the period, and a number of gameplay styles including control point capture, demolition or bombing missions, capture the flag/radio/codemachine and escape and evasion are the currently coded styles. We are also planning on adding rescue missions, where you'll rescue a general or famous figure. We've added support for some vehicles that players can ride into the action in, with guns 'ablazing', right now, we have a huey that players ride to the bomb target zone, and have plans for PT boats in future levels.

is this game on the original half life and by original i mean before steam version or on steam? because i have the original version and last time i got this it was from file-front and it was on the won version of half life not steam

ahh so it can be played in offline mode. because i dont like steam half life mods because my steam is hard to update. its so slow. im using broadband here in the philippines. Sun Broadband Wireless. its good for browsing. but im need download accelerators to download the file.